Ingredients:
- 4 cups (480g) confectioners' sugar, sifted
- 1/2 cup (60g) meringue powder
- 1/2 cup (120ml) warm water + 2-4 tablespoons (30-60ml) extra, for adjusting consistency
- 1 teaspoon (5ml) clear vanilla extract
- 1 tablespoon (15ml) light corn syrup (Optional but Recommended)
Instructions:
- Sift the confectioners' sugar into a large mixing bowl to ensure ultimate smoothness and prevent lumps.
- Add the meringue powder to the sifted confectioners' sugar in the bowl. Whisk briefly to combine the dry ingredients.
- Gradually add the 1/2 cup (120ml) of warm water to the sugar and meringue powder mixture. Stir thoroughly with a spoon or spatula until a smooth, paste-like base forms and all powdered ingredients are fully dissolved. This initial dissolving is crucial for a crack-free finish and prevents grittiness.
- Stir in the clear vanilla extract and the light corn syrup (if using). The corn syrup adds a subtle sheen and helps prevent brittleness, contributing to a more tender bite.
- Using an electric mixer (stand mixer with paddle attachment or hand mixer), beat the mixture on medium-high speed for 5-7 minutes. Continue mixing until the icing is bright white, glossy, and holds stiff peaks when the beater is lifted. Be careful not to over-mix, which can incorporate too much air and lead to a brittle finish.
- Adjust the consistency of the royal icing as needed by adding the extra warm water, one tablespoon at a time, until the desired piping or flooding consistency is achieved. For piping, it should be firm enough to hold its shape; for flooding, it should spread smoothly but not run off the cookie edge.